Concentrator.



PATENTED FEB. 18, 1908.

J. MAIT. CONGENTRATUR. APPLICATION FILED DBO. 31. 1906.

z SHEETS-SHEET 1.

WITNESSES:

PATBNTBD PEB. 18, 1908.

J. MAIT. `GONGENTRATOR APPLICATION FILED DBO. 31.1906.

2 SHEETS-SHEET 2.

1N VEN TOR I Wl TNESSES.'

AMOR

' 35 position while operating.

these cpenin s having turnable valves or Tiese valves or gates may be i'so as to expose more or less of the openings 23, and thus the amount ofair escaping through these openings will serve to maintain' the balancewithin the bellows without retaining so large a quantity within thebellows as would otherwise occur. That f y, the quantity of 'air jadmitted throng. the valves 22 will be substantially constant, but asthe bellows close a portion of this air will be discharged through theopenings 23, and the amount delivered against and through the woven orcanvas surface will be correspondingly diminished. Thus light materialcarrying ver light flake gold, or dust, may be separatedywithout soviolent an action as would tend to discharge all of the dust as well asthe ganguc, and by closing the ports 23 more or less the proportion ofair delivered to the riflied surface will be increased to `suit thecharacter of the material which is being worked. When the riflles havebeen sufficiently lcharged with 25 material, the riilie-board may bewithdrawn,

slidin outwardly at the lower end when release It is normally locked inposition by means of a lever 25 which is fulcrurned to the frame asshown at 26. A beveled or wedgeshaped block or projection 27 is carriedupon the side or sides of the riile-board, and the lever has lugs orsuitable attachments as 28,.which will bind and lock upon the blocks 27so -as to maintain the little-board in its By withdrawing this lockingdevice the riii'le-board may be easily removed, its contents emptied andthe hoard returned to lace again.

29 is a swinging atcb, of which there may 4c be one upon each side ofthe main frame, and

these latches may be turned down to bind upon the upper edges of thelittle-boxes, and

thus retain them'in place against the upward impulses of the bellows.

Having thus described my invention, what I claim and desire to secure byLetters Fatent, is-

1. In a concentrating and like apparatus,

the combination of a bellows hinged at one end, having inlet andregulating openings in the bottom board, means by which said bottomboard is reciprocated, a rifiie-board including a wire-supporting screenand a pervious woven fabric loosely fixed upon the surface of thescreen, riflles extending trans versely across said surface at intervalsand means including swinging .members pivotally secured to a xed part.of the apparatus and having free ends to envage the riflie board, bywhich the riile-board is removably locked upon the top of the bellows.

2. In a 'concentrator and the like, the combination of a bellows havinga hinged bottomboard with a valved inlet o ening e5 near the movable6nd,. a ritiie-board iavingy evene i a tight joint, with the upper sideof the bellows, fixed transverse bars at intervals across said board, awire screensurface supported upon said bars, a canvas or otherequivalent permeable fabric loosely fixed upon the top 70 of the screen7rillle bars in the form of obtuse angle plates fixed upon the transversebars of the rillie board so as to incline backwardly,

a source of supply from which material may be delivered upon the upperend of the canvas surface, a tilting spring-pressed gate by which thedischarge from such source is controlled, a crank or eccentric onsaid-shaft having connection with the free end of the bellows toreciprocate it,y a second crank or. 30 arm on said shaft, and arevoluble pin adjustably mounted on said second crank or arm and movablein unison with the crank,

a lever connecting with the gate and "intermittently actuated by thepin.

3. In a concentrating and like device, the combinatign of a bellowshinged atione end,

a rifile-board or support with a screen and a i canvas surfacesuperposed thereon, said canvas being loosely fixed transversely atintervals so that air forced against and through it will cause theintermediate .portions of the surface to curve upwardly at each impulse,

a valved opening through which air is admitted to the bellows, aneccentric or crank connected with the bottom board of the bellows, anarm fixed to the eccentric shaft,

a lug or roller radially adjustable 'upon said arm, a source of supplyfrom which material to be concentrated may? be delivered upon V theupper end of the canvas surface, a springpressed hinged valve wherebythe source. of supply is controlled, a lever arm extending from saidvalve and in line with the circle of revolution of the adjustable lugIwhereby the degree of opening. of the valve is regulated.

4.- In a concentrator and the like, the combination of an inclinedscreen and a loose superposcd canvas surface having back- W'ardlyinclined rifiles fixed transversely at 11o intervals, said canvas havingfree flexible sections between the rifiles, a bellows the upper part ofwhich forms a tight joint with the rilfle-boarch a hinge by which oneend of the bottom board of the bellows is connected, 115 swingingclamping members pivotal'ly connected to a iixed part of the apparatusand having their free ends adapted to bear downwardly on the screenframe to clamp it to the top of the bellows, a reciprocating niechanismconnected with the free end of said bottom board whereby said board isreciprocated, said bellows having an air inlet and an adjustable air'outlet whereby the pressure of air through the canvas is regulated.

5. In a concentrator and like apparatus, the combination of a bellowshaving a hinged movable bottom board with a valved inlet and anadjustable discharge opening, an inclined rifiie board forming a tightjoint with 130 the upper part of the bellows and removable with relationthereto, means for looking said board n position, said means including awedge-shaped block carried by the ritllef. board, a fulerumed leveradapted to inter- 100k with said block and a ivoted swinging link adated to engave Witi the upper edge of the r' e board tollock it in place;

JOSEPH MAIT.

' Witnesses:

S. H. NoURsE, FREDERICK E. MAYNARD.

